[tor-bugs] #20212 [Applications/Tor Browser]: Tor can be forced to open too many circuits by embedding .onion resources

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#20212: Tor can be forced to open too many circuits by embedding .onion resources
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 Reporter:  gacar                                |          Owner:  tbb-
                                                 |  team
     Type:  enhancement                          |         Status:  new
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  unspecified
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  guard-discovery,                     |  Actual Points:
  TorBrowserTeam201803                           |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by asn):

 Here is another attack from IRC arma: An attacker could also setup an
 onion address that redirects you to another onion address which redirects
 you to another onion address ad infinitum. This allows the attacker to
 cause `n` onion loads in series, and if each page has `k` onions, this
 allows attacker to cause `n*k` onion loads. That's both an optimization
 but is also meant to work around any defences that try to restrict onion
 address loads per origin.

 Furthermore, depending on how stream isolation works, the above attack
 could also work with IPs/domain addresses and not just onions.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20212#comment:13>
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